I don't believe there has ever been a FlexFuel version of the 3.8. To the original poster, as I understand it, the 1999 and 2000 vintage motors should be direct replacements.
Originally Posted by KillaGrn
Sold: 1998 DGC Sport 3.8 (Final odo: 178,000 miles)
Sold: 1998 Chrysler T&C LXi 3.8 (Final odo: 190,000 miles)
Sold: 2003 DGC ES 3.8 (Final odo: 172,000 miles)
1999 Chrysler T&C Limited 3.8 (Current odo: 200,000+ miles)
2001 Honda Accord EX-L V6 (4-Speed automatic)
2016 Mazda3 s Grand Touring 5-Door (6-Speed manual)